# PTU B.Tech Electrical Engineering 6th Semester May 2019 72839 ELEMENTS OF COMMUNICATION SYSTEM Question Papers

PTU Punjab Technical University B-Tech May 2019 Question Papers 6th Semester Electrical and Electronics Engineering (EEE)-EE-Electrical Engineering

Roll No.
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (Electronics Engg.) (OE 2012 Onwards)/
(Electrical & Electronics) (OE 2013 Batch)
(Sem.?6)
ELEMENTS OF COMMUNICATION SYSTEM
Subject Code : BTEEE-OPB
M.Code : 72839
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.

SECTION-A
1.

a. What is the need of modulation? Explain.

b. Define sampling theorem.

c. Differentiate between Fourier Series and Fourier transform.

d. Discuss the advantages of SSB.

e. Define the term fidelity.

f. Compare AM and FM modulation.

g. What do you mean by transmission channel? Explain.

h. Differentiate between low level and high level AM transmitters.

i. What is FSK? Discuss.

j. What do you mean by image rejection? Explain.

1 | M-72839

(S2)-215

SECTION-B
2.
What do you mean by noise? Discuss its different types. Also define noise figure and
noise factor.
3.
With the help of block diagram explain the working of Armstrong FM transmitter.
4.
Draw the block diagram and explain the function of different blocks of super heterodyne
5.
Discuss in detail the different modes of data transmission.
6.
Why multiplexing is required? Explain Time division data multiplexing technique.

SECTION-C
7.
Discuss PAM, PWM and PPM pulse modulation techniques in detail. Also compare the
three.
8.
Explain :

a) Directional capability of data exchange

b) DSB and SSB transmitters
9.
Discuss :

a) Satellite Communication

b) Data Compression

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any